20 cards where the card types include “creature” and the text includes “walk” and the color identity ≤ GRW and the mana value = 1

Court Cleric (Core Set 2019 #283)
Dwarven Grunt (Odyssey #185)
Dwarven Pony (Homelands #70)
Goblin Fireslinger (Modern Masters 2015 #114)
Goblin Mountaineer (Shards of Alara #102)
Goblins of the Flarg (Masters Edition #98)
Jukai Messenger (Champions of Kamigawa #218)
Kumano Faces Kakkazan // Etching of Kumano (Kamigawa: Neon Dynasty #152)
Kumano Faces Kakkazan // Etching of Kumano (Kamigawa: Neon Dynasty #152)
Kytheon, Hero of Akros // Gideon, Battle-Forged (Magic Origins #23)
Kytheon, Hero of Akros // Gideon, Battle-Forged (Magic Origins #23)
Marsh Boa (Prophecy #118)
Mountain Goat (Classic Sixth Edition #195)
Rime Dryad (Ice Age #260)
Scorched Rusalka (Ravnica Remastered #122)
Scorch Spitter (Core Set 2020 #159)
Shanodin Dryads (Seventh Edition #269)
Slumbering Dragon (Magic 2013 #148)
Weatherseed Elf (Urza's Legacy #115)
Willow Dryad (Portal #193)
Zodiac Goat (Portal Three Kingdoms #132)
Zodiac Rabbit (Portal Three Kingdoms #162)

This search is finished. Now the real work can begin.